Author: David Van SymmPublisher:
ISBN:
Category : Aberdeen-Angus cattle
Languages : en
Pages : 114
Book Description
Comparison of Feedlot and Carcass Characteristics of Hereford and Angus Steers
Author: David Van SymmPublisher:
ISBN:
Category : Aberdeen-Angus cattle
Languages : en
Pages : 114
Book Description
Response of Feedlot and Carcass Characteristics to Selection and Crossbreeding
Author: Donna Jo CoxPublisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 270
Book Description
Feedlot Performance, Carcass and Palatability Traits, as Well as Subsequent Economic Relevance in Calf-fed and Yearling Holsteins and Angus Steers
Author: Cassie S. AbneyPublisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 214
Book Description
Inheritance and Interrelations of Live Performance and Carcass Characteristics in Beef Cattle
Author: Robert B. ChurchPublisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 0
Book Description
An investigation was undertaken to evaluate live performance, carcass characteristics and meat quality traits of 183 progeny test steers sired by 10 Hereford, 3 Charolais, 1 Holstein and 1 Angus sires and from grade Hereford dams. An additional group of 10 steers were Hereford sired, from Holstein X Hereford dams. Disproportionate data necessitated an analysis of variance using a nested or hierarchial classification. Components of variance were estimated for groups (feeding method, ranch and breed), sires within groups and progeny within sires. Heritabilities were calculated from paternal half sib correlations. Intercorrelations among 42 performance and carcass traits were calculated. Sire variance and heritability estimates were high for feedlot average daily gain (ADG) for the calves which were fed to market condition rapidly (fed-calf program) but were low for those carried on a lower plane of nutrition for 174 days followed by full feeding to market condition (fed-yearling program). High heritabilities were obtained for lifetime average daily gain (LADG) under both programs and would therefore seem to be a more useful measure of gainability than feedlot ADG. Dressing per cent and per cent kidney fat showed significant sire differences with heritability estimates of 78 per cent and 45 per cent respectively. Measures of fat cover over the rib-eye had low heritabilities which were probably influenced by marketing at an appraised constant finish. Fat cover per cwt. had a higher heritability at 46 per cent and would therefore be a preferred measure for progeny testing purposes. With a heritability of 89 per cent, rib-eye area per cwt. was superior to rib-eye area, rib-eye depth and per cent separable lean in a rib core, for detecting sire progeny differences in leanness. Rib-eye depth proved to be of no value in this regard. No significant group or sire within group differences were obtained for retail yield although the heritability estimate was 29 per cent for this trait. Marketing at an appraised constant finish may have masked sire differences for this measure. Sire progeny groups did not differ in ether extract of longissimus dorsi muscle, a measure of marbling. Sire progeny group differences were easily detected for tenderness of the longissimus dorsi muscle. A similar result was obtained for muscle fiber diameter. Average fat cover was the best individual predictor of retail yield accounting for 29 per cent of its variation. Estimating yield by the U.S.D.A. formula of Murphey et al. (1960) was no more accurate as a predictor than fat cover alone. Other possible predictors of retail yield along with their coefficients of determination were; per cent trimmed chuck (17 per cent), per cent trimmed round (15 per cent), per cent separable lean in a rib core (11 per cent) and rib-eye area per cwt. (6 per cent). No significant relationships were found between measures of gain and retail yield or measures of quality and retail yield.
Efficiency and Profit Differences of Angus, Charolais and Hereford Cattle Varying in Size and Growth
Author: V. H. BrungardtPublisher:
ISBN:
Category : Aberdeen-Angus cattle
Languages : en
Pages : 8
Book Description
Live Animal Performance, Carcass Characteristics and Palatability of Various Breeds and Crosses
Author: Nelson Jennings AdamsPublisher:
ISBN:
Category : Beef cattle breeds
Languages : en
Pages : 452
Book Description
Feedlot and Carcass Characteristics of Bulls Vs. Steers for Beef Production
Author: Efficiency and Profit Differences of Angus, Charolais and Hereford Cattle Varying in Size and Growth
Author: V. H. BrungardtA Feed Lot and Carcass Comparison of Hereford and Holstein Steers
Author: Remi Ernest MonfortonPublisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 84
Book Description
Performance and Carcass Characteristics in Individually Fed Steer and Heifer Calves
Author: Amos Paul KennedyPublisher:
ISBN:
Category : Calves
Languages : en
Pages : 232
Book Description